Pathological Properties of on the Mycelia and Fruit Body of .

Recently, has been reported as a new pathogen of shiitake (). However, its pathological properties are not much known. To further understand its impact on the mushroom, we investigated the pathogen's interactions with the mycelium of shiitake, histopathological properties, host range, and sensitivity to diverse antifungal agents. The strain . DUCC 4014 inhibited the mycelial growth of strain (cultivar Sanjo 701ho) and caused browning in the mycelia confronted with the yeast on PDA. Spray inoculation of the yeast caused an abnormal browning symptom on the cap and/or gills of three shiitake cultivars grown on sawdust media in vinyl bags. Scanning electron microscopic images of the abnormally browned parts of shiitake fruit body illustrated that mushroom tissues were loosed and dispersed in the middle and edge of the cap and the arrangement of basidiospores borne on basidia in the gills was disturbed compared to those of normal shiitake fruit body. Spray inoculation also led to developing abnormal browning on the harvested fruit body, indicating . could be a problem during mushroom storage. But the yeast was not able to induce abnormal browning on mushrooms of and But it induced browning only on button mushroom () when they were inoculated after wounding. Tests with 16 kinds of fungicides revealed that the cell growth of could be inhibited by benzalkonium chloride at MIC 7 μg/ml and benomyl at MIC 3 μg/ml.